Cloud Functions errorFirebase Cloud Functions: secret is undefined or empty

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Why the secret is missing, and the fix

1. 01

   The function doesn’t bind the secret

   “Only functions that specifically include a secret in their secrets option will have access to that secret as an environment variable.” Firebase, Configure your environment (secrets)

   Defining a secret isn’t enough. Each function that reads it has to list it in its secrets option.

   const { onRequest } = require('firebase-functions/v2/https');
   const { defineSecret } = require('firebase-functions/params');
   
   const apiKey = defineSecret('PAYMENTS_API_KEY');
   
   exports.checkout = onRequest({ secrets: [apiKey] }, async (req, res) => {
     const key = apiKey.value();
     res.json({ ok: Boolean(key) });
   });

2. 02

   The value is read at the top of the file

   “This means that fetching parameter values during global scope results in deployment failure.” Firebase, Configure your environment (parameters)

   Calling .value() in global scope breaks the deploy. Read it inside the handler or in onInit. onInit runs for every function in the file, so check the value isn’t empty where the secret isn’t bound.

3. 03

   The secret changed but functions didn’t

   “Whenever you set a new value for a secret, you must redeploy all functions that reference that secret for them to pick up the latest value.” Firebase, Configure your environment (managing secrets)

   Running functions keep the value they were deployed with. Redeploy every function that uses the secret after you set a new value.

4. 04

   The secret was deleted

   “Functions that use a secret value that has been deleted will fail silently.” Firebase, Configure your environment (managing secrets)

   Check it still exists with firebase functions:secrets:get, and set it again if not.

Checked against the vendor’s docs on November 9, 2026: Firebase docs: Configure your environment.

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Related: Firebase Functions deploy failed · Firebase callable INTERNAL error · Firebase Functions timeout · Firestore unsupported field value: undefined